Prince Charles taught his son Prince William the proper knighting technique while on holiday.

Time magazine’s Catherine Mayer reports that Charles, William, Camilla Parker Bowles, Kate Middleton and baby George were gathered at their Scotland estate Birkhall when Charles called William to a practice session.

William, Mayer says in the new issue, needed to “master the key move of granting knighthoods, laying a blade on the shoulders of recipients, ideally without inflicting injury.”